I tried making some small frag disks this time. For a mold I used a $9 plastic door mat from Canadian Tire with 1" holes which made over 200 disks at once. They dont have the little pegs in the bottom like the store bought ones do but I dont use egg crate anyways.
I used 4:1 sand to portland cement again and I noticed that the disks are a little more brittle. They are still relatively strong but I am able to snap them in half with my figures although it does take considerable effort. So for future reference 3:1 might be the way to go for these smaller types.
Underneath the mat I had an old sheet of glass because I was worried about the cement sticking down. Peeling everything up was pretty easy and then all I had to do was pop each disk out of the holes with my figures. Now like the other disks I need to cure these in fresh water for about 6 weeks before I can use them.
